Case Environmental
Case Environmental

Chlorination Certificates & Disinfection

We are providing chlorination services during the Coronavirus lockdown but are prioritising emergency jobs and those where there is a public health concern.  We are following social distancing guidance and ask the same from customers.


Disinfection/chlorination of premises following lockdown

Current UK Government guidance is to treat plumbing systems that have been out of regular use (and not flushed weekly or where the control regime has not been effective) as a new system and chlorinate prior to using.  The requirement for chlorination can be as little as two weeks out-of-use and as such many business and educational premises may require this service.  It is recommended that this is carried out a week before the buildings are in use again.  Please contact us if this is a service you may require.


Case Environmental is a south west based national chlorination contractor providing water chlorination/sterilisation/disinfection, testing and UKAS sampling services throughout the UK - call 01626 249 042 to discuss your requirements.  Our chlorinators hold current EUSR National Water Hygiene Cards and WIAPS certification that can be produced upon request.  For further information or a quote please email or complete the form below.


Our Clients  We provide our chlorination/disinfection services to nationwide clients including the leading coffee shops, international brand fast food premises, chain restaurants, the largest online international retailers/distributors, healthcare premises, hospitals, HMP Service, councils, house builders, construction, schools and educational facilities.


Chlorination process

  1. Flush/swab pipe work/tank/reservoir.  Record background chlorine residual.
  2. Introduce 50ppm (mg/l) chlorine solution.
  3. Allow high level chlorine to sit in contact for 1 hour.
  4. Flush pipe work until recorded background chlorine level is reached, de-chlorinating water as necessary.  Test & record onsite parameters.
  5. If collecting a UKAS microbiological sample, wait 30 minutes prior to sample collection.


Chlorination Certificate  Disinfection by chlorination is often a contract requirement for new internal plumbing services prior to handover.  A chlorination certificate may also be needed for new 'over-sized' water pipes prior to a new water connection; before connection to mains pipe work the water company will need to see a chlorination certificate (to British Standards BS6700, BS EN 806 or BS8558) and if needed, the satisfactory sample results of a UKAS certified microbiology test.


Where needed a chlorination certificate can be provided on the same day.  An example of a chlorination certificate is provided at the bottom of the page.


Chlorination equipment  We use  chlorine dosing equipment to ensure the correct chlorine residual throughout the length of the water pipe.  Onsite chlorine levels are electronically measured using a photometer and microbiological samples (if needed) are tested in an UKAS laboratory.  All materials, products and chemicals used are approved for use in contact with drinking water.  This includes low bromate sodium hypochlorite.


Why is chlorination required?  The chlorination process ensures and demonstrates that the pipe work is hygienic and the water is free from contamination.  Chlorination is important for newly installed pipe work or existing plumbing systems that have been out of use.


Why Case Environmental?  Case Environmental is a business run by Andrew Case, an experienced, qualified water quality scientist with over 17 years experience in the water industry.  Case Environmental use accurate chlorination equipment and offer a complete and thorough understanding of the regulations and how they apply in your circumstances.


Chlorination advice  We will happily provide no-obligation free chlorination and disinfection advice - please contact us to  discuss your site requirements for a prompt estimate.


Last Minute/Same Day Chlorination Certificate?  If you need a last minute, same day chlorination certificate, please give us a call to see if we can help.


Chlorination after prolonged period of non-use

The HSE document; Legionnaires’ disease Part 2: The control of legionella bacteria in hot and cold water systems details the actions to take when recommissioning plumbing systems taken out-of-use (and not regularly flushed).  Specifically, paragraph 2.52 on page 24 states that prior to ue the system should be treated as a new installation and cleaned, flushed and disinfected;


As well as commercial buildings, disinfection by chlorination should be considered for domestic properties such as those that have been unoccupied for a prolonged period prior to new owners/tenants.


Chlorination/disinfection/sterilisation/flushing services can also be provided for the following;

  • Tank chlorination
  • Office, Shop, restaurant and cafe shopfitting
  • Rental properties
  • Holiday park chlorination
  • Hotel chlorination
  • New domestic plumbing installations on new builds
  • New mains chlorination
  • Emergency chlorination
  • Commissioning of new buildings (frequent contract requirement)
  • Private water to mains conversions
  • Post major building extensions and alterations
  • After bacterial contamination
  • Legionella - disinfection to HSE ACOP L8 (Legionnaires' disease. The control of legionella bacteria in water systems)
  • Facilities management
  • Water system hygiene management
  • Systems not in regular use or flushed
  • Annual or routine system maintenance

Water company chlorination requirements and guidance;

Chlorination Test Certificate

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Locations covered by Case Environmental include (but are not limited to);


Bedfordshire, Berkshire, Bristol, Buckinghamshire, Cambridgeshire, Cheshire, City of London, Cornwall, Cumbria, Derbyshire, Devon, Dorset, County Durham, East Riding of Yorkshire, East Sussex, Essex, Gloucestershire, Greater London, Greater Manchester, Hampshire, Herefordshire, Hertfordshire, Isle of Wight, Kent, Lancashire, Leicestershire, Lincolnshire, Merseyside, Norfolk, North Yorkshire, Northamptonshire, Northumberland, Nottinghamshire, Oxfordshire, Rutland, Shropshire, Somerset, South Yorkshire, Staffordshire, Suffolk, Surrey, Tyne and Wear, Warwickshire, West Midlands, West Sussex, West Yorkshire, Wiltshire, Worcestershire, Bath, Birmingham, Bradford, Brighton & Hove, Bristol, Carlisle, Cambridge, Canterbury, Chester, Chichester, Coventry, Derby, Durham, Ely, Exeter, Gloucester, Hereford, Kingston-upon-Hull, Lancaster, Leeds, Leicester, Lichfield, Lincoln, Liverpool, London, Manchester, Newcastle-upon-Tyne, Norwich, Nottingham, Oxford, Peterborough, Plymouth, Portsmouth, Preston, Ripon, Salford, Salisbury, Sheffield, Southampton, St Albans, Stoke-on-Trent, Sunderland, Truro, Wakefield, Wells, Westminster, Winchester, Wolverhampton, Worcester and York.



Blaenau Gwent, Bridgend, Caerphilly, Cardiff, Carmarthenshire, Ceredigion, Conwy, Denbighshire, Flintshire, Gwynedd, Isle of Anglesey, Merthyr Tydfil, Monmouthshire, Neath Port Talbot, Newport, Pembrokeshire, Powys, Rhondda Cynon Taff, Swansea, Torfaen, Vale of Glamorgan, Wrexham, Bangor, Cardiff, Newport, St Davids and Swansea.



Ayrshire, Dumfries and Galloway, Edinburgh and The Lothians, Glasgow and Clyde Valley and The Borders.


London Boroughs

Barking and Dagenham, Barnet, Bexley, Brent, Bromley, Camden, City of London, Croydon, Ealing, Enfield, Greenwich, Hackney, Hammersmith and Fulham, Haringey, Harrow, Havering, Hillingdon, Hounslow, Islington, Kensington and Chelsea, Kingston upon Thames, Lambeth, Lewisham, Merton, Newham, Redbridge, Richmond upon Thames, Southwark, Sutton, Tower Hamlets, Waltham Forest, Wandsworth and Westminster.


Water Companies

Affinity Water, Albion Water, Anglian Water, Bournemouth Water, Bristol Water, Cambridge Water Company, Cholderton and District Water Company, Dee Valley Water, Dŵr Cymru Welsh Water, Essex and Suffolk Water, Hartlepool Water, Northumbrian Water, Portsmouth Water, Severn Trent Water, South East Water, Southern Water, South Staffordshire Water, South West Water, Sutton and East Surrey Water, Thames Water, United Utilities, Wessex Water, Yorkshire Water and Youlgrave Waterworks.

Example Chlorination/Disinfection Certificate PDF
Example Chlorination Certificate.pdf
Adobe Acrobat document [270.8 KB]
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